Hack saw



D. E. GMMl-:L

HCK 5A' Filed Feb, 1, 1926 3 Shasta-Shut 1.

INVENTOR.

ATroRNEYs" i Y 1 646,369 o@ 1s, 1921. E. GOMMEL man sAw Filed Feb. 1, 1926 3 sheets-Sheet 2 F' .2. ,e1 a 71,31 15 f2 46 4f 15 f4 f .3j

JZ g5 11 10 Ilgn l `14 INVENTOR, 77 75- BV ewfy 'om mel A TTORNE YS 1646,3 9 oct' I8 192." D. E. GOMMEL 6 HACK SAW Filed Feb. l. 1926 5 Sheets-Sheet 3 3j F3 30 Z3 INVENTG'R.

ewgeyi''ommcl www Patented oci. 18.71927. y

`UNITED. STATES 1,646,369 PATENT OFFICE.

DEWEY E. GOMMEL, oF INDIANAroLIs, INDIANA, AssIGNoR r.ro E. o. A'rxINs a COMPANY, or INDIANAPOLIS, INDIANA, A CORPORATION OF INDIANA.

HACK SAW.

Application led February The object of my invention is to produce improvements in details of construction of a reciprocating hack saw, or other cutting tool, particularly in the fluid pressure means for controlling the cutting position vof the saw and for raising the saw away from the work during return strokes.

The accompanying drawings illustrate my invention.

Fig. 1 is a side elevation of a machine embodying my improvements;

Fig. `2 is a plan view;'

Fig..3 is a horizontal of Fig. 1;

Fig. 4 is a vertical section, on an enlarged scale, of the movable clamping Vjaw and adjacent parts; j

Fig. 5 is a vertical section, on an enlarged scale on line 5--5 o f Fig. 1;

Fig. 6 is a fragmentary horizontal section of the primary valve reversing mechanism, and

' Fig. 7 is a vertical section, on an enlarged scale, through the saw reciprocating cylin- 25 Vder and a portion ofthe saw elevating mech- In the drawings 10 indicates a suitable upportin base formed at its upper end ino a wor receiving platform or table 11 30 provided with a stationary jaw 12 and a movable jaw 13 which is mounted in suitable slides in table .11 and shiftable by means of the threaded screw 14 and hand wheel 15, so

that the material 16 to be cut may be I5 clamped in the usual manner between the jaws 12 and 13.

Erected `from section on line 3 3 the base 10 is ia., vertical standard 20 having vertical guidewa s 21` upon which are slidably mounted a lock 0 22 -and a block 23. p

Block 22 carries, near its upper end, a saw guide 24 upon which is reciprocably mounted a saw frame 25in which may be mounted a saw blade 26.

5 Attachedv to the frame 25 is 'a piston rod 27- projected through a suitable packing gland 28 and carrying a piston 29 in'cyliner 30, said cylinder having ipes 31 and 32 leadi intoits o posite en s.

l" 'Bl' 23 lies bellow block 22 and is carried by the upper end of the piston rod 32 supported by apxilston 33 in a vertical cylinder 34 (dotted 'es Fig. 1 the arran ement being` such that the entire weight o block 5 23- and block 22 together 4with the various 1, 1926. Serial No. 85,162.

parts carried thereby, including the saw guides and saw frame, will be supported by the liquid in cylinder 34.

The lower end of block 22 is provided with a roller and the upper .end of block 23 is provided with two ixed-axis rollers 41, 41 and a movable-axis roller 42 which is carried at the upper end of link 43 pivoted at 44 in block 23 and normally urged to its upper position by sprin 45%l Longitudinally slidable between rol er 40 on one side and the rollers 41 and 42 on the other side is a tongue 46 pivoted at 47 on the saw frame 25 the .arrangement being such that when roller 42 is in its upper osition, finger 46 will be raised up out oi) contact with rollers 41.

' Mounted on block 23 is arvalve casing 50 in which is mounted a spring pressed poppet valve 51 the stem of which is projected upwardlyv so as to just contact with a plate 52 carried on block 22 when block 22 is at vits reatest distance from block 23, as will be ereafter explained. Leading to valve casing is a supply pipe 53 and leading from said casing is a drainpipe 54, a drain cock 55 being arranged in pipe 53.

lfipes 31 and 32 communicate with a valve 'casing 60 in which is mounted a V-valve 61. Leading from casing beneath valve 61 is a drain pipe 63 into which pipe 54 Vd-ischarges. Leading into casi 6() is a supply pie64y which leads` from suitable `pump 65 otted lines Fig. 1) which may be operated by a suitable motor 66 and may draw its supply from a drainage sump 67 into lvlvhich ave e usual s rin ressed 'b ass. Leading from pipepetg P y p of cylinder 34 is a supply pipe 68 provided with a. valve 69. Pipe 53 at its lower end communicates with the lower end of cylinder 34.

Valve 61 is rovided with a stem 70 connected by linkPl with a crank 72 on a rock shaft 73'journaled at one lend in a. bearing 74 on base 10 and at the other end iii a bracket 75 carried by the movable jaw 13. Splined oii shaft 73 adjacent bracket 75 is a bevel pinion 76 which meshes with a ipe 63 discharges. Pump 65 may into the lower end bevel pinion 77 carried at the lower end of a rock shaft 78 journaled in jaw 13 and pro vided Aat its upper end Ywith, an arm 79 adapted to be en ged b the ri ht hand (Fig.- 1) of t e saw ame. ournaled in jaw 12 is a rock shaft 80, similar to shaft 78, rovided at its upper end with anarm 81 Eke arm 79, and at its lower end with a bevel pinion 82 which meshes with a bevel pinion 83 secured to shaft 73.

The operation is as' followsz-In Fi 1 the saw irame is shown at the limit o its non-cutting stroke; roller 42 is in its upper position; finger 46 is out of contact with rollers 41, 41; the saw blade 26 is held out of contact with the work; cvlinder 34 is full of suitable liquid, such as oil, and valve 61 has been shifted so as to bring pipe 31 into 1 cutt' communication with the interior of casing 60; valve 51 is seated so as to close communication between pipe '53 and 54 through valve casing 50 and the stem of valve 51 1s in contact with plate 52. Flow of liquld through ipe 31 into cylinder 30 will drive the saw rame to the eft through its cutting stroke. The initial movement of this cuttin stroke causes nger46 to shift roller 42 to t e left (Fig. 7) thus permitting block 422 to f.drop sllghtly whereupon -valve 51 iso ed and the wei ht restm on block 23 e ects a small quantity of liquid from cyline'r 84(throu h valve casing 50 and pipe 54 so that bloc 23 may move downwardly until it has separated from block 22 an amountsucient-to permit valve 51 to close. The leakage past valve 51 will continue as Vlong as plate 52 is capable of holdin valve l51 open and this contact between p ate 52 and the stem of valve 51 continues so long as blade 26 continues to cut into thematerial 16, so that the saw is free to progress through the material as rapidly as 1t is .capable ofA progressing. When the end of the stroke of the saw is a proached, the right d de ending `arm (v ig. 1)' of the saw frame wi engaelinger 9 and rock shaft 73 so as to shi valve 61 to put pipe A31 into communication with the drainage ip e 63 and pipe 32 into communication with the left hand end of cylinder 30 so that-the saw frame will promptly start upon its return,-or nonfcutting. stroke. By this time head 2'3 has moved downwardly enough to permit valve 51 to close so that further downward movement of the block 23 is arrested. Immediately upon the beof the return stroke of the saw ame, finger \46, being now moved to the right (Fig. 7) permits'arm 43 to .swing to the right,thus elevating roller 42 so that finger 46, acting upon roller 40, serves toA raise block 22 just enough to free the teethv of saw 26 from the wor during e return stroke of the saw. v y

In ordenthat'the speed of operationmay 'be readily adjusted arm 72 may have an extension capable of movingbetween the adinstable sto these s'tnps 91 and 9,2. By adjusting e lead of 'valve"61relative to the ports pipes 31 and 32 may be varied mltting leakage of the supporting liquid `during the active stroke of the saw andY means for raising said Saw frame withoutchangin theA height of the fluid support during t e non-active stroke ofthe saw.

2. In a hack saw, the combination of a saw guide, a saw frame reciprocably mounted-on said guide, means provldin a fluid support for said saw frame, means or reciprocating said saw frame, and means controlled by ,the reclprocatxng saw frame for permitting leakage of the su porting liquid during the active stroke of t ie saw.

3. The combination of a reci rocable cutting tool, means providin a uid` sup ort for said cutting tool mova le at an ang e to the movement of reciprocation means for reciprocating said tool, means or releasing said Huid support during reciprocation of the tool in one direction and means for raislng said tool without changing the height of gicll fluid support during a stroke of the 4. The combination of a reciprocable cutting tool, a support for said cutting tool movable at an angle to the movement of reciprocation, a second support subjacent the first support, fiuid (pressure means for supporting said seconV support, a valve controlling outlow from said fluid ressure means and means for opening sai valve,

said valve and o ening means being carried respectively by t e two supports, andvmeans for separating the two su ports during noncuttin reciprocation of t ie tool to close the valve uring such stroke.

5. The combination of a reciprocatin outtingtool, a support for said cutting tooi movable at an angle to the movement of reciprocation, fluid pressure means for sustaining said su port, a valve controlling outiiow from sai fluid pressure means, means controlled b Athe reciprocating tool for holding said va ve open during the major portion of the cutting strokeY only of said tool.

6. The combination of a `reciprocating cutting tool, a support for said cutting tool, movable at 4an .angle to the movement of reciprocation, fluid pressure means for sustaining said sugfort, a valve controlling outow from said uid Vpressure means, mean con, trolled bythe reci ropa tool for holding said valve open' e ma'or rtion ofthe eutti stroke only of 'said todi and means contro -Ml-by l10ncutting reciprocation of the tool for raising said tool from the Work.

`7. The combination of a reciproeable cutting tool, a support for said tool movable atan angle to the line of reeiproeation, yieldable sustaining means for said support and means controlled by the reciprocating tool for releasing said yieldable sustaining means during the cutting stroke of the tool.

8. In a hack saw, the combination of a reci rocablesaw frame, a guide for said frame, a4 lock supporting said guide and movable along a line at an anglevto the line of reciprocation, a second block sub]acent the first block, a uid pressure support for said second block, a valve controlling outfidw from said Huid pressure support, means for opening said valve, said valve and opening means being carried respectively by the two blocks, and means controlled by the saw reciprocation, for alternately moving said blocks top ward and from each other.

9. In a hack saw, a reciprocating frame, a guide for said frame, a block supporting said guide and movable along a line at an angle to the line of reciprocation, a second block subjacent the first block, a fluid pressure support for said second block, a valve controlling outlet from said Huid ressure support, means for alternately moving said two blocks toward and from each other, and means controlled by said alternate movement of said blocks for alternately opening and closing said valve.

10. In a hack saw, the combination of a reciprocable saw frame, a guide for said frame, a block supporting said guide and V movable in a line at an angle to the line of reciprocation, a second block subjacent the first block, a yielding support for the second block, means bv which said yielding support may be release( and means controlled by tlie reciprocating frame for actuating said releas ing means to release the yielding support during cutting reciprocations of the cutting tool.

11. The combination of a reciproeable cutting tool, a support for said tool movable in a line at an angle to the line of reciprocation, a yielding support for said first'mentioned support, means by which said yielding su ort may be alternately released and esta lished, and means active during cutting reciprocations of the tool for activating said support releasing means.

12. The combination of a reciprocating tool, a block supporting said tool movable along a line ciprocatlon,

. of 'the tool in one direction.

13. The combination of a reciprocating tool, a block supporting said tool movable along a line at an angle to the line of reciprocation, a second block subjacent the first block, a finger carried by the reciprocating tool and slidably interposed between the two blocks and a member carried by one of said blocks and co-actin with said finger to separate the blocks during reeiprocation of the tool in one direction, fluid pressure means for supporting the second block, a valve controlling outow from said fluid ressure means and carried by one of said blocks, and means dependent upon tool reciprocation for holding said valve open during tool reeiprocations in one direction.

14. The combination of a reciprocating tool, a block supporting said tool movable along a line at an angle to the line of reciprocation, a second block subjacent the first block a finger carried by the reciproeating tool and slidably interposed between `the two blocks, a link pivoted upon one of the blocks and engaging the finger, said link being biased toward a position tending to displace the finger laterally relative to the link carrying block.

15. The combination of a reciprocating tool, a block supporting said tool movable along a line at an angle to the line of reciprocation, a second block subjacent the first block, a finger carried by the reciproeating tool and slidably interposed between the two blocks, a link pivoted upon one of the blocks and engaging the finger, said link being biased toward a position tending to dis lace the finger laterally relative to the lin carryinglblock, fluid vpressure means for supporting t e second block, a valve controlling outflow from said fluid pressure means and carried by one of said blocks, and means dependent upon tool reciprocation for holding said valve open during tool reciprocations in one direction.

, In witness whereof, I Dnwiir E. GoMMrL V'have hereunto set my hand at Indianapolis, Indiana, this 26th day of January, A. D. one thousand nine hundred and twenty-six.

DEVEY E. GOMMEL.

tion of the tool for raising said tool from the work.

7. The combinationrof a reciprocable cutting tool, a support for said tool movable at an angle to the line of reciprocation,

yieldable sustaining means for said supportv and means controlled by the reciprocating tool for releasing said yieldable sustaining means during the cutting stroke of the tool.

8. In a hack saw, the combination of a reci rocable saw frame, a guide for said frame, a Iblock supporting said guide and movable along a line at an angle to the line of reciprocation, a second block subjacent the first block, a fluid pressure support for said sec ond block, a valve controlling outflow from said Huid pressure support, means for opening said valve, said valve and opening means being carried respectively by the two blocks,

and means controlled by the saw reciprocation, for alternately moving said blocks top ward and from each other.

9. In a back saw, a reciprocating frame, a guide for said frame, a block supporting said guide and movable alonga line at an angle to the line of reciprocation, a second block subjaeent the first block, a fiuid pressure support for said second block, a valve controlling outlet from said fluid ressure support, means for alternately moving said two blocks toward and from each other, and Vmeans controlled by said alternate movement of said blocks for alternately opening and closing said valve.

10. In a hack saw, the combination ofa reciprocable saw frame, a guide fior said frame, a block supporting said guide and movable in a line at an angle to the line of recipiocation, a second block subjacent the first block, a yielding support for the second block, uicalis by which said yielding support may be releaseand means controlled by the reciprocating frame for actuating said releasing means to release the yielding support during cutting reciprocations of the cutting tool.

11. The combination of a reciprocable cutting tool, a support for said tool movable in a line at an angle t0 the line of reciprocation, a yielding support for said first mentioned support, means'by which said yielding suport may be alternately released and estabiished, and means active during cutting reciprocations of' the tool for activating said support releasing means. n r

l2. The combination of a reciprocating tool, a block supporting said tool movable at an angle to the line of rea second block subjacent the first block, a finger carried by the reciprocating tool and slidably interposed between the two blocks and a member carried b one of said blocks and colacting with said nger to separate the blocks during reciprocation ofthe tool in one direction. y

13. The combination of a reciprocating tool, a block supporting said tool movable along a line at an' angle to the line of reciprocation, a second block -subjacent the first block, a finger carried by the reciprocating tool and slidably interposed between the tWo blocks and a member carried by one of said blocks and co-acting with said finger to separate the blocks during reciprocation of the tool in one direction, fiuid pressure means for supporting the second block, a valve controlling outflow from said fluid ressure means and carried by one of said blocks, and means dependent upon tool reciprocation for holding said valve open during tool reciprocations in one direction.

14. The combination of a reciprocating tool, a block supporting said tool movable along a line at an angle to the line of reciprocation, a second block subjacent the first block, a finger carried by the reciprocating tool and slidably interposed between the two blocks, a link pivoted upon one of along a line ciprocation,

the blocks and engaging the finger, said linkV being biased toward a position tending to displace the finger laterally relative to the link carrying block.

15. The combination of a reciprocating tool, a block supporting said tool movable along a line at an langle to the line of rcciprocatioii, a second block subjacent the first block, a finger carried by the reciprocating tool and slidably interposed between the two blocks, a link pivoted upon one of the blocks and engaging the finger, said link being biased toward a position tending to dis lace the finger laterally relative to the liii carrying block, fluid pressure means for supporting the second block, a valve controlling outflow from said fluid pressure means and carried by one of said blocks, and means dependent upon tool reciprocation for holding said valve open during tool reciprocations in one direction.

Iii witness whereof, I DEWEY E. GoMMi-in have hereunto set my hand at Indiana olis, Indiana, this 26th day of .lanuary D. one thousand nine hundred and twenty-six.

DElVEY E. GOMMEL.

Certicate o! Correction.

Patent No. 1,646,369.

Granted October 18, 192?, to

DEWEY E. GOMMEL. It is hereby certified that error appears in the pinted s ecification of the abovenumbered patent requiring correction as follows age 2, ine 126, claim 6, for the Word mean read means; and that the said Letters Patent should be read with this correction therein that the same may conform Patent Office.

Signed and sealed this 8th day of to the record of the casein the November, A. D. 1927.

M. J. MOORE, .doti/ng Conmiaaiofier of Patents.

Certcate of Correction.

Panam; No. 1,646,369. Granted October 18, 1927, to DEWEY E. GOMMEL.

It is hereby certified that error appears in the rinted s ecication of the abovenumbered patent; requiring correction as follows: age 2, ine 126, claim 6, for the word mean read means; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the oase in the Patent Oice.

Signed and sealed this 8th day of November, A. D. 1927.

[sun] M. J. MOQRE,

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